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Kellner, currently BSD's client manager and senior communications strategist, made the announcement on his Twitter feed on Monday. He starts his new job in two weeks. McCaskill later tweeted: "Happy to have @kellnaah on board as digital director. We're gonna have to overlook that Red Sox/Patriot thing.#mo #11in11."

Kellner's going to need all the experience he can draw on: Polls show that McCaskill is going to be in for a tough re-election fight in 2012.

Brunner has hired Connect Strategic Communications to manage his web presence. Connect briefly worked on former Governor of Utah John Huntsman's presidential campaign web site at the beginning of the governor's bid.